Phosphorus-free scale inhibitor and preparation method thereof

Abstract

The invention discloses a phosphorus-free scale inhibitor which is prepared from the following raw materials: nuclear microspheres, citrate, modified 8-hydroxyquinoline, nonylphenol polyoxyethylene ether ammonium sulfate, tryptophan, acetone and deionized water. The invention also discloses a preparation method of the phosphorus-free scale inhibitor, the preparation method comprises the following steps: adding the core microspheres and acetone into a photocatalytic reactor, stirring for 5-10 minutes at the room temperature and the rotating speed of 50-100 r / min, then adding citrate, modified 8-hydroxyquinoline, ammonium nonylphenol polyoxyethylene ether sulfate and tryptophan, continuously stirring for 10 minutes without changing the rotating speed, finally adding deionized water, increasing the rotating speed to 100-200 r / min, vacuuming and introducing nitrogen, and then turning on the UV lamp, performing stirring reaction for 2-4h, and obtaining the phosphorus-free scale inhibitor after the end of the reaction. The scale inhibitor does not contain any organic phosphorus or inorganic phosphoric acid, the risk of microbial pollution of a membrane system and the pollution discharge influence on the environment are reduced, and the scale inhibitor is easy to disperse.

Description

technical field [0001] The invention belongs to the technical field of scale inhibitor preparation, and in particular relates to a phosphorus-free scale inhibitor and a preparation method thereof. Background technique [0002] Reverse osmosis is a water treatment technology that uses membrane separation. Using the principle of reverse osmosis, a reverse osmosis membrane with a high degree of selective permeability is used to pass a part of the feed water through the membrane in a direction perpendicular to the membrane to make dehydration salt. Colloidal substances will be concentrated on the surface of the membrane, and the remaining part of the feed water will take away the concentrated substances along the direction parallel to the membrane. This method can make the removal rate of inorganic salts, hardness ions, organic matter and bacteria in water reach 97-98%. Reverse osmosis technology is more and more widely used because of its environmental protection, energy saving...

AI Technical Summary

Problems solved by technology

[0003] In order to prevent the scale problem caused by the increase of ion concentration caused by concentration in the membrane, high-efficiency scale inhibitors are used for treatment. For mine water with high hardness, high alkalinity and high chloride in coal mine sewage treatment plants, the conductivity is usually 10000μs / cm, the sulfate content is about 2000mg / L, and the chloride is about 2000mg / L, which requires very high antiscalant performance. However, conventional chemicals are prone to physical and chemical pollution of the membrane surface during operation. The water channel is blocked, which will lead to an increase in the operating pressure of the system and the pressure difference between the sections, and a decrease in the water output or desalination rate of the system. Even careful or frequent on-line chemical cleaning sometimes does not help, and even causes the membrane element to be extracted and scrapped.